CGAL users discussion list

[Philipp Moeller <>]

David Coeurjolly 
<>
 writes:

> Dear cgal-discuss,
>
> I'm having issues with a customization of CGAL Polyhedron_3 and after 
> discussing about that with couple of CGAL gurus, I'm posting my problem 
> here. 
>
> I would like to construct a Polyhedron_3 upon a specific point class (not a 
> custom vertex class via wrappers). More precisely, I would like to use  
> Weighted_point  class which decorated a template class point with "weights" 
> (note: Weighted_Point inherits from the given class Point). Hence, my new 
> class of points satisfies with the point concept and many of the 
> methods/functions dealing with points can use the weighted points.... 
> except Polyherdon_3...
>
> More precisely, I'm doing something like that:
>
> typedef CGAL::Exact_predicates_inexact_constructions_kernel     K;
> struct My_items : public CGAL::Polyhedron_items_3 
> {
>   template <class Refs, class Traits>
>   struct Vertex_wrapper {
>     typedef CGAL::Weighted_point<typename Traits::Point_3, double>  Point;  
> //CustomPoints
>     typedef CGAL::HalfedgeDS_vertex_base<Refs,CGAL::Tag_true,Point>  Vertex;
>   };
>   template < class Refs, class Traits>
>   struct Halfedge_wrapper {
>     typedef CGAL::HalfedgeDS_halfedge_base<Refs>                      
> Halfedge;
>   };
>   template < class Refs, class Traits>
>   struct Face_wrapper {
>     typedef typename Traits::Plane_3 Plane;
>     typedef CGAL::HalfedgeDS_face_base<Refs, CGAL::Tag_true, Plane>   Face;
>   };
> };
> typedef CGAL::Polyhedron_3<K, My_items >     Polyhedron_3;
>
> but when I want to use it (for example to compute the convex hull of 
> weighted point considering only the point coordinates), I get an 
> compilation error in the Polyhedron_3 class  (not matching function 
> ‘CGAL::HalfedgeDS_in_place_list_vertex<...) which seems to be related to 
> Halfedge containers. Note: for the rest of the process, I really need the 
> weights to be associated with the points and not the polyhedron 3 
> vertices...
>  
> Am I doing something wrong ? How can I customize the Point class in 
> Polyhedron ? 

Can you try to give a minimal example that fails to compile (all
includes, a main that triggers instantiation), the full error output and
the CGAL version you are using? A compiler version would be helpful as
well.

Thanks,
Philipp